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Simple Machines Forum (SMF) XSS issue

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title: Simple Machines Forum (SMF) XSS issue author: Jose Carlos Norte discovered by: Jose Carlos Norte 1. introduction Simple machines forum is a popular scalable free bulletin board system written in php over mysql database, the url of the project: http://www.simplemachines.org/ 2. XSS problem SMF is vulnerable to XSS attacks in search functions, in a string passed in base64 to search for re-fill the form search when we want to modify our search. example: index.php?action=search;params=bWF4YWdlfCd8Ij5YU1N8InxicmR8J3x8InxzaG93X 2NvbXBsZXRlfCd8fCJ8c3ViamVjdF9vbmx5fCd8fCJ8c2VhcmNofCd8c3NzfCJ8c29ydF9ka XJ8J3xkZXNjfCJ8c29ydHwnfHJlbGV2YW5jZQ there are diferent fields vulnerable and a XSS successfull attack is posible, tested. Solution: i was unable to contact smf developer team.